If this is a corporate phone it may not be possible to remove the password requirement.
Also as Dubdub stated it is a wise option to have. Many people who have lost their Blackberry's have wished they had one set.
you will get accustomed to the password. It also seems that a person who did not read the manual might want to at a minimum take advice from those who offer experience.
Just in case your still not willing to here are the instructions.

To set a BlackBerry smartphone password
On the Home screen of the BlackBerry smartphone, click the Options icon.
Click Security Options.
Click General Settings.

Note: If you are running BlackBerry® Device Software version 4.0.2 or earlier, click Options and then Security.
Note: If you are running BlackBerry Device Software version 4.6 or later, click Options and then Password.

Change the Password field to Enabled.
Display the menu, and click Save.
Type the new password, and click Enter.
Type the new password again, and click Enter.

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